so 2k = 0?
so no value of k will equal 0, unless its 0, which isn't right.
So i thought maybe i have to write it out like:
2x - 4y -3k = 0
0 + 0 +2k = 0
k = 0;
2x -4y = 0;
so if x = 2, and y = 1 then u'll get 0 = 0, but thats for the top row....hm..what am i not getting? THanks!

You started with
[2 -4 -3]
[-3 6 0+k]
which I take to mean
[2 -4 -3]
[-3 6 k]

To "row-reduce" add 3/2 the first row to the second row.
3/2(2)= 3 and adding that to -3 gives 0
3/2(-4)= -6 and adding that to 6 gives 0
3/2(-3)= -9/2 and adding that to k give k- 9/2. that will equal 0 when
k= 9/2.